[12.x] Add static constructor to guest middleware

[rodrigopedra]

From the default aliased middleware that takes parameters, Illuminate\Auth\Middleware\RedirectIfAuthenticated was the only one missing a static constructor.

Reference:

framework/src/Illuminate/Foundation/Configuration/Middleware.php

Lines 779 to 802 in 2f30936

	protected function defaultAliases()
	{
	$aliases = [
	'auth' => \Illuminate\Auth\Middleware\Authenticate::class,
	'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
	'auth.session' => \Illuminate\Session\Middleware\AuthenticateSession::class,
	'cache.headers' => \Illuminate\Http\Middleware\SetCacheHeaders::class,
	'can' => \Illuminate\Auth\Middleware\Authorize::class,
	'guest' => \Illuminate\Auth\Middleware\RedirectIfAuthenticated::class,
	'password.confirm' => \Illuminate\Auth\Middleware\RequirePassword::class,
	'precognitive' => \Illuminate\Foundation\Http\Middleware\HandlePrecognitiveRequests::class,
	'signed' => \Illuminate\Routing\Middleware\ValidateSignature::class,
	'throttle' => $this->throttleWithRedis
	? \Illuminate\Routing\Middleware\ThrottleRequestsWithRedis::class
	: \Illuminate\Routing\Middleware\ThrottleRequests::class,
	'verified' => \Illuminate\Auth\Middleware\EnsureEmailIsVerified::class,
	];
	if (class_exists(\Spark\Http\Middleware\VerifyBillableIsSubscribed::class)) {
	$aliases['subscribed'] = \Spark\Http\Middleware\VerifyBillableIsSubscribed::class;
	}
	return $aliases;
	}

As such, in codebases that avoid using middleware aliases (preferring to use their FQCN), one would need to manually concatenate a custom guard to the Illuminate\Auth\Middleware\RedirectIfAuthenticated middleware class name, while all others provide a static constructor.

Usage example:

use Illuminate\Auth\Middleware\RedirectIfAuthenticated;
use Illuminate\Routing\Controllers\HasMiddleware;

class ForgotPasswordController implements HasMiddleware
{
    public static function middleware(): array
    {
        return [
            // 'guest:app', // before
            RedirectIfAuthenticated::using('app'), // after
        ];
    }
}

This PR:

• Adds a static constructor to the Illuminate\Auth\Middleware\RedirectIfAuthenticated middleware.
• Adds a related test case (based on the analog Illuminate\Auth\Middleware\Authenticate static constructor's test).